Card text

If the Defending Pokémon is Pokémon-ex, that Pokémon can't attack during your opponent's next turn.

Gang Up むらがる

10×

Does 10 damage times the number of Pokémon and Pokémon you have in play.

Trivia

It was ruled that, for the purpose of Gang Up, a dual-type Darkness/Metal Pokémon counted only once, meaning that the guaranteed damage for the attack is 10, not the 20 it would have been guaranteed had the two types been counted separately.